# ACT Aspire Math: Finding a Quadratic Formula from Its Solution

Eonho applied the quadratic formula to a quadratic equation and obtained the solution .

Which of the following could be the quadratic equation that he solved?

ACT Aspire | Math |

ACT Aspire Math | Algebra |

Math | Algebra |

Product Type | ACT Aspire |

Test Prep | ACT Aspire ACT Aspire Math |

### Transcript

why yang ho won't simply tell us what the quadratic

equation he was working with woz But you know you

wonder why does he always have to make things difficult

Whatever We don't need your help The quadratic formula is

x equals negative b plus or minus squared b squared

minus four a c over to a remember that thing

Well since yon ho used the quadratic formula we can

deduce that negative b equals negative too So b equals

two And looking at the denominator of yon house equation

what we can see that two way is ten So

is five Look at us where math detectives while the

quadratic formula is applied to equations of the form a

x squared plus b x plus c is zero So

at this point we know that yang ho could have

started with the equation Five x squared plus two x

plus c is zero where c is still unknown Well

we could just find sea by setting negative fifty six

equal to b squared minus four a C which is

same as two squared minus four times Five si but

well there's really no need because only one answer Choice

has the desired values for a and b it's right

there It's answer choice be so that's it Take that 00:01:30.083 --> [endTime] young ho