5x^2 - 80 = 0
5x^2 = 80
x^2 = 80/5
x^2 = 16
x = sqrt 16
x = (4,-4) <===
Answer:
x=2, x=-2
Step-by-step explanation:
3x²-3+4x²-12=13
7x²=13+12+3
7x²=28
x²=4
x=-2
x=2
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Answer:
He will earn £186.89 interest
Step-by-step explanation:
final = original x multiplier^n
final = 2000 x 1.015^6
final = 2186.886528
Interest = final - original
Interest = 186.8865
