Question Simplify the expression −7z+21 Evaluate −7(z−3)Apply the distributive property −7z−(−7×3)Multiply the numbers −7z−(−21)Solution −7z+21 Show Solution Find the roots z=3 Evaluate −7(z−3)To find the roots of the expression,set the expression equal to 0 −7(z−3)=0Change the sign 7(z−3)=0Rewrite the expression z−3=0Move the constant to the right side z=0+3Solution z=3 Show Solution
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