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x= -b/2a = -(-7)/2(1) =7/2
substitusikan x² - 7x +12
y=x² - 7x +12
= (7/2)² - 7(7/2) + 12
= 49/4 - 49/2 + 12
=49/4 - 98/4 + 48/4
= -1/4
titik puncak (x,y) = ( 7/2 , -1/4)
7). y= 2x² +4x - 6 =0 >>> x²+2x -3 =0
=(x+3)(x-1)=0
x1= -3 , x2= 1
titik potong (x1,0) dan (x2,0) = (-3,0)(1,0)