show that half is the zero of the polynomial 2x raise to the power 2 +7x - 4
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p(x) = 2x² + 7x - 4
p(1/2) = 2* (1/2)² + 7 * 1/2 -4
= 2* 1/4 + 7/2 -4
= 1/2 + 7/2 -4
= (1+7-8)÷ 2 ( LCM=2 )
= 0 ÷ 2
= 0
∴ 1/2 is the zero of the polynomial 2x² + 7x - 4
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