answer: 4x² + 9x - 28.
multiply the factors together:
4x times x = 4x²
4x times 4 = 16x
-7 times x = -7x
-7 times 4 = 28
therefore, (4x-7) times (x+4) = 4x² + 16x -7x = 28
next, you must condense and simplify your answer:
16x -7x equals 9x
your final answer should be 4x² + 9x - 28.