Question

Multiply

(3x – 7)(3x – 5)
Question 5 options:

9x2 – 36x + 35


9x2 + 36x + 35


9x2+ 6x + 35


9x2 – 36x – 35

Answer 1

`\large\boxed{(3x-7)(3x-5)=9x^2-36x+35}`

Explanation:

`\text{Use FOIL:}\ (a+b)(c+d)=ac+ad+bc+bd\\\\(3x-7)(3x-5)\\\\=(3x)(3x)+(3x)(-5)+(-7)(3x)+(-7)(-5)\\\\=9x^2-15x-21x+35\qquad\text{combine like terms}\\\\=9x^2+(-15x-21x)+35\\\\=9x^2-36x+35`