Q. Factor the expression completely.−90x2+20x4Answer:
Identify GCF: Identify the greatest common factor (GCF) of the terms in the expression −90x2+20x4.The GCF of −90 and 20 is 10, and the GCF of x2 and x4 is x2.
Factor out GCF: Factor out the GCF from the expression.−90x2+20x4=10x2(−9+2x2)
Further Factoring: Look for any further factoring possibilities within the parentheses.The expression inside the parentheses is a quadratic expression that can be factored further.−9+2x2 can be rewritten as 2x2−9, which is a difference of squares.
Factor Difference of Squares: Factor the difference of squares.2x2−9 can be factored as (2x+3)(2x−3), where 2 is the square root of 2.
Combine Factored Parts: Combine the factored parts to write the final factored expression. 10x2(−9+2x2)=10x2(2x+3)(2x−3)