91Ó°ÊÓ

Now let's move on to factorizations that may require two or more techniques. In Exercises \(17-80,\) factor completely, or state that the polynomial is prime. Check factorizations using multiplication or a graphing utility. $$20 y^{2}+12 y+1$$

Factor each polynomial using the negative of the greatest common factor. $$-15 x^{2}+20$$

In Exercises \(45-66,\) factor any perfect square trinomials, or state that the polynomial is prime. $$x^{2}-4 x+4$$

Use the method of your choice to factor each trinomial, or state that the trinomial is prime. Check each factorization using FOIL multiplication. $$6 x^{2}-7 x y-5 y^{2}$$

$$\text { In Exercises } 43-66, \text { factor completely.}$$ $$2 x^{2}-14 x+24$$

Use factoring to solve quadratic equation. Check by substitution or by using a graphing utility and identifying \(x\)-intercepts. \((x+3)(3 x+5)=7\)

Factor each polynomial using the negative of the greatest common factor. $$-8 x^{4}+32 x^{3}+16 x^{2}$$

In Exercises \(45-66,\) factor any perfect square trinomials, or state that the polynomial is prime. $$x^{2}+22 x+121$$

Use the method of your choice to factor each trinomial, or state that the trinomial is prime. Check each factorization using FOIL multiplication. $$15 x^{2}+11 x y-14 y^{2}$$

Use factoring to solve quadratic equation. Check by substitution or by using a graphing utility and identifying \(x\)-intercepts. \(y(y+8)=16(y-1)\)