Evaluate:
xy2(x - 5y) + 1 for x = 2 and y = 1.
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xy2(x - 5y) + 1
= x(1+1)y2 - 5xy(2+1) + 1
= x2y2 - 5xy3 + 1
For x = 2 and y = 1,
22 x 12 - 5 x 2 x 13 + 1
= 4 x 1 - 5 x 2 x 1 + 1
= 4 - 10 + 1
= - 5
Hence, for x = 2 and y = 1, the value of [xy2(x - 5y) + 1] is - 5.
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xz (x2 + y2) for x = 2, y = 1 and z = 1.
x(x - 5) + 2 for x = 1.
2x(3x - 5) - 5(x - 2) - 18 for x = 2.
Multiply and then verify:
-3x2y2 and (x - 2y) for x = 1 and y = 2.