Question Factor the expression 21(x−90) Evaluate 21x−45Solution 21(x−90) Show Solution Find the roots x=90 Evaluate 21x−45To find the roots of the expression,set the expression equal to 0 21x−45=0Move the constant to the right-hand side and change its sign 21x=0+45Removing 0 doesn't change the value,so remove it from the expression 21x=45Multiply by the reciprocal 21x×2=45×2Multiply x=45×2Solution x=90 Show Solution
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