Tom S. answered 09/22/21
Experienced, Patient Secondary School, College, and SAT/ACT Math Tutor
Dear Chloey, The area of a triangle is length times width. The 3x + 4 and 7x - 2 are the length and width. So multiply them together.
Work out (3x + 4)(7x - 2) and you will have the answer! (Use the FOIL method if you have learned that.)
Tom S.