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What should be added to `4c (– a + b + c)` to obtain `3a (a + b + c) – 2b(a – b +

asked Jan 18, 2022 in 8th-maths by purvi (1.8k points)

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Subtract `b (b^2 + b – 7) + 5` from `3b^2 – 8` and find the value of expression obtained for `b = –

asked Jan 18, 2022 in 8th-maths by sumit (1.6k points)

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If `x-1/x=7` then find the value of

asked Jan 18, 2022 in 8th-maths by uday (1.6k points)

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Factorise

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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Factorise `p^4 + q^4 +

asked Jan 18, 2022 in 8th-maths by yogita (1.8k points)

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Find the value of (i) `(6.25 6.25 –1.75 1.75)/4.5` (ii) `(198 198 –102

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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The product of two expressions is `x^5 + x^3 + x`. If one of them is `x^2 + x+ 1`, find the

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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Find the length of the side of the given square if area of the square is 625 square units and then find the value of x.

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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Take suitable number of cards given in the adjoining diagram [G`(x xx x)` representing `x^2`, R `(x xx 1)` representing x and Y `(1 xx 1)` representing 1] to factorise the following expressions, by arranging the cards in the form of rectangles: (i) `2x^2 + 6x + 4` (ii) `x^2 + 4x + 4`. Factorise `2x^2 + 6x + 4` by using the figure.

asked Jan 18, 2022 in 8th-maths by Simran (1.8k points)

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The figure shows the dimensions of a wall having a window and a door of a room. Write an algebraic expression for the area of the wall to be painted.

asked Jan 18, 2022 in 8th-maths by uday (1.6k points)

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Match the expressions of column I with that of column II: Column I Column II (1) `(21x + 13y)^2` (a) `441x^2 – 169y^2` (2) `(21x – 13y)^2` (b) `441x^2 + 169y^2 + 546xy` (3) `(21x – 13y) (21x + 13y)` (c) `441x^2 + 169y^2 – 546xy` (d) `441x^2 – 169y^2 + 546xy`

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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Multiplicative inverse of `2^7`

asked Jan 18, 2022 in 8th-maths by nishit (1.8k points)

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The human body has about 100 billion cells. This number can be written in exponential form

asked Jan 18, 2022 in 8th-maths by Arun (1.7k points)

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`(-4)^4 xx(5/4)^4`

asked Jan 18, 2022 in 8th-maths by purvi (1.8k points)

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`(2^-3)^2 xx (3^-2)^3`

asked Jan 18, 2022 in 8th-maths by yogita (1.8k points)

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The distance between earth and sun is 150 million kilometres which can be written in exponential form as

asked Jan 18, 2022 in 8th-maths by Arun (1.7k points)

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Very small numbers can be expressed in standard form using positive

asked Jan 18, 2022 in 8th-maths by nikhil (1.8k points)

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`(–10) xx (–10) xx (–10) xx (–10) =

asked Jan 18, 2022 in 8th-maths by krutika (1.7k points)

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Simplify

asked Jan 18, 2022 in 8th-maths by purvi (1.8k points)

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Find x so that `(–5)^(x+1) xx (–5)^5 =

asked Jan 18, 2022 in 8th-maths by sumit (1.6k points)

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