Question 689954
Given: {{{Y = -2X^2 + 15X + C}}}
And the point (3,89)
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That means that when you plug 3 into the equation for X, then Y will be 89.
Rewrite the equation
{{{89 = -2*(3)^2 + 15*(3) + C}}}
Simplify the equation
{{{89 = -2*9 + 45 + C}}}
Simplify the equation
{{{89 = -18 + 45 + C}}}
Combine like terms
{{{89 = 27 + C}}}
Subtract 27 from both sides
{{{highlight(62 = C)}}}