Asked by Sandra
Use the quadratic formula to solve the equation. If necessary, round to the nearest hundredth.
x² – 21 = –4x
• 7, 3
• –7, 3
• 7, –3
• –7, –3
x² – 21 = –4x
• 7, 3
• –7, 3
• 7, –3
• –7, –3
Answers
Answered by
Reiny
put it into standard form of a quadratic ...
x^2 + 4x - 21 = 0
how nice that it factors ....
(x+7)(x-3) = 0
so x = ... or x = ....
x^2 + 4x - 21 = 0
how nice that it factors ....
(x+7)(x-3) = 0
so x = ... or x = ....
Answered by
Reiny
But you wanted to use the formula ...
x = (-4 ± √100)/2
= (-4 ± 10)/2
= (-4+10)/2 or (-4-10)/2
= .....
x = (-4 ± √100)/2
= (-4 ± 10)/2
= (-4+10)/2 or (-4-10)/2
= .....
Answered by
Anonymous
h^2-2h-2=0
Answered by
hi
it’s -7,3
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