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Write the equation in factored form then stayed the X intercepts

Write the equation in factored form then stayed the X intercepts-example-1
User Zeesy
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1 Answer

11 votes
11 votes

Step 1

Given;


y=x^2+x-20

Required; To write the equation in factored form

Step 2

Find the two factors that when added gives you x and when multiplied gives -20x²


\begin{gathered} \text{The factors are 5x and -4x} \\ \end{gathered}


\begin{gathered} R\text{eplace x with 5x-4x} \\ x^2+5x-4x-20 \\ \text{Factorize the expression} \\ x(x+5)-4(x+5)_{} \\ y=(x-4)(x+5) \end{gathered}

Step 3

State the x-intercept


\begin{gathered} (x-4)(x+5)=0 \\ x-4=0 \\ or \\ x+5=0 \\ x=4 \\ or \\ x=-5 \end{gathered}

Hence, the x-intercepts are;

x=4

x=-5

User Jdstaerk
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