A number is decreased by seven. Then, the new number is multiplied by 3 to get an answer of -9. What is the original number?
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Function: y = 2x²-5
<u>Find y-intercept:</u>
y = 2(0)²-5
y = -5
<u>Find x-intercept:</u>
2x²-5 = 0
2x² = 5
x² = 2.5
x = ±√2.5
x = -1.5811 , 1.5811
Graph plotted:
