The correct option is B 9y^2 + 30y + 25(a+b)^2=a^2+2ab+b^2 (3y+5)(3y+5) = (3y)^2 + 2 × 3y × 5 + 5^2 = 9y^2 + 30y + 25 ...

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Expansion of (x+y)^2

Evaluate: 3y+...

Question

Evaluate: (3y+5)(3y+5) = ______

4 y^{2} + 10 y + 25

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9 y^{2} + 30 y + 25

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4 y^{2} + 20 y + 25

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4 y^{2} + 30 y + 15

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Solution

The correct option is B $9 y^{2} + 30 y + 25$
$(a + b)^{2} = a^{2} + 2 a b + b^{2}$
$(3 y + 5) (3 y + 5)$
$= (3 y)^{2} + 2 \times 3 y \times 5 + 5^{2}$
$= 9 y^{2} + 30 y + 25$

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