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a = 2, b= 4, c= -9
x= -b/2a
x= -4/2.2
x= -4/4 =1
y=-d/4a
y= -b^2-4ac/4a
y= -88/4.2
y= -88/8 = -11
(1, -11 )
maka nilai dari
a = 2
b = 4
c = - 9
nilai x dari persamaan
x = -b/2a
= -4/2(2)
= -4/4
= -1
nilai y dari persamaan ( subtitusikan nilai x)
y = 2x² + 4x - 9
= 2(-1)² + 4(-1) - 9
= 2 -4 - 9
= -11