28. perform the indicated operations. simplify your answer a. (x+3)(2x-1) b. (x+5)(x-5) c. (x+2)^2 d. (2x^2 +11x- + 6) 29. convert to scientific notation a. 0.125 b. 435,000 30. factor 3x +x-4 31. factor 4x^2 -16y= 32, factor x+8=33. solve the equation x^2-2x-15 = 0 34. simplify 35. perform the indicated operations. simplify your answer x^2+4x +4 a. 3x+2x^2 5x15r x-2 x +1 3x +34 45

relating to or denoting a system of numbers and arithmetic based on the number ten, tenth parts, and powers of ten.

step-by-step explanation:

could you provide figure.

hello from mrbilldoesmath!

answer:

(7 x + 6 y) (49 x^2 - 42 x y + 36 y^2)

discussion:

the trick is to recognize that 343 = 7^3 and 216 = 6^3 and, in general,

a^3 + b^3 =   (a + b) (a^2 - a b + b^2).

in our case

343x^3+216y^3   =   (7x)^3 + (6y)^3

so take a = 7x and b = 6y in the above equation to get the answer.

you,

mrb