(a) (7xy + 4y2)x(3y2 +8x2) verify the answer x=1 y=2
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Answer:
840
Step-by-step explanation:
(7xy+4y2)×(3y2+8x2) ....(I)
Given that,
x=1 and y=2
by putting values of x and y in eq. (I)
= (7×1×2+4×2×2)×(3×2×2+8×1×2)
= (14+16)×(12+16)
= (30)×(28)
= 840
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