Identify quadratic trinomial: Identify the quadratic trinomial and look for common factors.The given expression is 7x2+28x−35. We can see that 7 is a common factor of all three terms.
Factor out GCF: Factor out the greatest common factor (GCF) from the expression.The GCF of 7x2, 28x, and −35 is 7. So we factor out 7 from the expression.7(x2+4x−5)
Factor quadratic expression: Factor the quadratic expression inside the parentheses.We need to find two numbers that multiply to −5 (the constant term) and add up to 4 (the coefficient of the x term).The numbers that satisfy these conditions are 5 and −1.
Write factored form: Write the factored form using the numbers found in Step 3.We can now express x2+4x−5 as (x+5)(x−1).
Combine GCF with factored form: Combine the GCF factored out in Step 2 with the factored form from Step 4.The completely factored form of the expression is 7(x+5)(x−1).