Question

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Solve Question no 8,9,10 with explanation.....​

Answer 1

Answer:

$(5x - 2)(2x + 4) \\ = 5x(2x + 4) - 2(2x + 4) \\ = 10x {}^{2} + 20x - 4x - 8 \\ = 10x {}^{2} + 16x - 8$

$x {}^{2} (a - x) + x {}^{2} (a + x) \\ x {}^{2} (a - x + a + x) \\ = 2ax {}^{2}$

$area = (a {}^{2} + b {}^{2} + c {}^{2} ) \times 3abc$

Answer 2

Q8. (5x - 2)(2x + 4)

$= {10x}^{2} + 20x - 4x + 8$

$= {10x}^{2} + 16x + 8$

Q9.

${x}^{2}(a - x) + {x}^{2}(a + x)$

$= a {x}^{2} - {x}^{3} + a {x}^{2} + {x}^{3}$

$= 2a {x}^{2}$

Q10.

Area of a rectangle = Length × Breadth

=

$( {a}^{2} + {b}^{2} + {c}^{2})(3abc)$

$= 3 {a}^{3}bc + 3a {b}^{3}c + 3ab {c}^{3}$