Question
Find the following product:
$(5x + 7)(3x + 4)$
$(5x + 7)(3x + 4)$
✓
Answer
$(5 x+7)(3 x+4)$
$=5 x(3 x+4)+7(3 x+4)$
$=(5 x \times 3 x+5 x \times 4)+(7 \times 3 x+7 \times 4)$
$=15 x^2+20 x+21 x+28$
$=15 x^2+41 x+28 a$
$=5 x(3 x+4)+7(3 x+4)$
$=(5 x \times 3 x+5 x \times 4)+(7 \times 3 x+7 \times 4)$
$=15 x^2+20 x+21 x+28$
$=15 x^2+41 x+28 a$
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