If 2 is zero of polyniminal 4y²-6y-k, find value of 0
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4y² - 6y - k = 0
4(2)² - 6(2) - k = 0
16 - 12 - k = 0
4 - k = 0
k = 4
4y² - 6y - 4 = 0
4y² - (8 - 2)y - 4 = 0
4y² - 8y + 2y - 4 = 0
4y ( y - 2) + 2(y - 2) = 0
(4y + 2) (y - 2) = 0
4y + 2 = 0 or y - 2 = 0
4y = (-2) or y = 2
y = - 2/4 or y = 2
y = - 1/2 or y = 2
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