Example 5: Simplify the expressions and evaluate them as directed:
a) x (x-3) + 2 for x = 1,
(i) 3y (2y - 7) - 3 (y - 4) - 63 for y = -2
Solution:
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Answered by
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a) 0
i) 21
a) x²-3x+2
=x²-2x-x+2
=x(x-2)-1(x-2)
=(x-2)(x-1)
for x=1
(1-2)(1-1)=(-1)(0)=0
________________
i) 3y(2y-7)-3(y-4)-63
6y²-21y-3y+12-63
6y²-24y-51
for y=-2
6(-2)²-24(-2)-51
=6(4)+48-51
=24+48-51
=72-51
=21
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