Question Simplify the expression 20x2−840x Evaluate 20x2−56x×15Solution 20x2−840x Show Solution Factor the expression 20x(x−42) Evaluate 20x2−56x×15Multiply the terms 20x2−840xRewrite the expression 20x×x−20x×42Solution 20x(x−42) Show Solution Find the roots x1=0,x2=42 Evaluate 20x2−56x×15To find the roots of the expression,set the expression equal to 0 20x2−56x×15=0Multiply the terms 20x2−840x=0Factor the expression More Steps Evaluate 20x2−840xRewrite the expression 20x×x−20x×42Factor out 20x from the expression 20x(x−42) 20x(x−42)=0When the product of factors equals 0,at least one factor is 0 20x=0x−42=0Solve the equation for x x=0x−42=0Solve the equation for x More Steps Evaluate x−42=0Move the constant to the right-hand side and change its sign x=0+42Removing 0 doesn't change the value,so remove it from the expression x=42 x=0x=42Solution x1=0,x2=42 Show Solution