Question Factor the expression 3(5a−7) Evaluate 15a−21Solution 3(5a−7) Show Solution Find the roots a=57Alternative Form a=1.4 Evaluate 15a−21To find the roots of the expression,set the expression equal to 0 15a−21=0Move the constant to the right-hand side and change its sign 15a=0+21Removing 0 doesn't change the value,so remove it from the expression 15a=21Divide both sides 1515a=1521Divide the numbers a=1521Solution a=57Alternative Form a=1.4 Show Solution
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