Anonymous
Anonymous asked in Science & MathematicsMathematics · 9 years ago

Quadratic Grade 10 math question!?

h=-5t2 +30t +10

the 2 is the squared

When will the h be zero?

h=height

t=time

please dont just give answer show steps!

1 Answer

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  • 9 years ago

    When will the h be zero?

    Set the h as 0

    0 = -5t^2 +30t + 10

    move it to the other side

    5t^2-30t-10 = 0

    5(t^2-6t-2)=0

    t^2-6t-2=0

    t = [6±√(-6)^2-4(1)(-2) ]/ 2

    t = [6±√44 ]/ 2

    t = [6±2√11]/2

    t = 3±√11

    You should discard 3-√11 because there is no such thing as negative time

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