Identify Form: Identify the form of the quadratic trinomial.The given expression 5x2+25x+20 represents a quadratic trinomial in the form ax2+bx+c.
Find Common Factors: Look for common factors in all three terms.The coefficients 5, 25, and 20 all have a common factor of 5.Factor out the greatest common factor (GCF) of 5.5(x2+5x+4)
Factor Out GCF: Factor the quadratic expression inside the parentheses.We need to find two numbers that multiply to give ac (where a is the coefficient of x2 and c is the constant term) and add up to b (the coefficient of x).In this case, a=1, b=5, and c=4, so we need two numbers that multiply to 4 and add up to a0.The numbers 4 and a2 satisfy these conditions.
Factor Quadratic Expression: Write the quadratic expression as a product of two binomials.Using the numbers found in Step 3, we can write the quadratic expression as:(x+4)(x+1)
Write as Product: Combine the GCF factored out in Step 2 with the factored quadratic expression from Step 4.The factored form of the original expression is:5(x+4)(x+1)