Question

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$(3x + 4y) {?}^{2}$
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Answer 1

Answer:

The answer is   $9x^2+24xy+16y^2$

Step-by-step explanation:

$\left(3x+4y\right)^2$

$\mathrm{Apply\:Perfect\:Square\:Formula}:\quad \left(a+b\right)^2=a^2+2ab+b^2$

$a=3x,\:\:b=4y$

$=\left(3x\right)^2+2* \:3x* \:4y+\left(4y\right)^2$

$\left(3x\right)^2=9x^2$

$2* \:3x* \:4y=24xy$

$\left(4y\right)^2=16y^2$

$=9x^2+24xy+16y^2$