ok so 6x exponent 2 now insert a 7 for the x so that = to 6×7 exponent 2 so that =42 exponent 2 which equals to 84
now you have 4x + 8 so insert the 7 in for the "x" now you have 4×7 +8 4×7=28 and 28+8=36 and 84+36=120
