Question

Himpunan penyelesaian
y = 4x
y = 5x^2 + 9x

Answer 1

4x = 5x^2 +9x
0 = 5x^2 +9x -4x
0= 5x^2 + 5x
0= 5 (x^2 -1)
x+1 = 0 atau x-1 = 0
x = -1 atau x = 1
HP={-1,1}

Answer 2

Y = 4x
y = 5x^2 +9x

4x = 5x^2 + 9x
4x - 9x = 5x^2
-5x = 5x^2
x = 5x^2/5
x = x^2
x = akar x

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