Question

Can u guys answer question 6 (ii) and (iii)

Answer 1

Step-by-step explanation:

Answer

2)(3x + 4)(3x - 5)

We know that,

(x + a)(x - b) = $\sf{x}^{2} +x(a - b) - ab$

So, (3x + 4)(3x - 5) = $\sf{(3x)}^{2}$ + 3x(4 - 5) - 4(5)

= $\sf{9x}{2}$ - 3x - 20

3)$\sf{-3a + 5b + 4c}^{2}$

We know that,

$\sf{a + b + c}^{2} = {a}^{2} + {b}^{2} + {c}^{2}$ + 2ab + 2bc + 2ca

= (-3a)² + (5b)²+ (4c)² + 2(-3a)(5b) + 2(5b)(4c)+ 2(4c)(-3a)

= 9a² - 25b² + 16c² - 30ab + 40bc - 24ca

HOPE IT HELPS...

Answer 2

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Answer is attached .. 6-