ladnerhailey16
19.07.2019 •
Mathematics
Use the quadratic formula to solve the equation x2 - 4x = -7
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Ответ:
Let's solve your equation step-by-step.
x2−4x=−7
Step 1: Subtract -7 from both sides.
x2−4x−(−7)=−7−(−7)
x2−4x+7=0
Step 2: Use quadratic formula with a=1, b=-4, c=7.
x=
−b±√b2−4ac
2a
x=
−(−4)±√(−4)2−4(1)(7)
2(1)
x=
4±√−12
2
No real solutions.
Ответ:
12 * $9 = $108