Question

Find the area, radius = 8cm.


Simplify: 4x2(x+2)+3x(5x2+2x-6)-5(3x2-4x).

Answer 1

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$<u>Solution$

Given Radius = 8cm

Area of circle = πr2.

Area of a circle = 3.14 × 8 × 8 [We know, pi (π) = 3.14].

= 3.14 × 64.

= 200.96 square cm or 200.96 cm2.

Answer - 200.96 square cm or 200.96 cm2.

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Second Question

4x2(x+2) +3x(5x2+2x-6) -5(3x2-4x).

= 4x3 + 8x2 + 15x3 + 6x2 – 18x – 15x2 + 20x.

= 4x3 + 15x3 + 8x2 + 6x2 – 18x + 20x.

= 19x3 + 14x2 + 2x.

Answer - 19x3 + 14x2 + 2x

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Answer 2

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