Can someone please explain these algebra problems? Need help fast

I need a little help solving these. Please show your work and tell me how you got the answer so I'll know c:



Multiply and simplify: 10x(9x^2 + 6x + 7)
90x^2 + 60x + 70
9x^2 + 16x + 7
90x^3 + 60x^2 + 70x
90x^3 + 130x

The expression (2x + 3)(3x + 4) simplifies to which of the following?
2x(3x + 4) + 3(3x + 4)
2x(2x + 3) + 3(3x + 4)
2x(3x + 4)
2x(3x + 4) + (3x + 4)

Simplify.
(x2 + 5x + 8)(x2 + 2x + 6)

x^4 + 10x^2 + 48
x^4 + 2x^3 + 6x^2 + 7x + 14
x^4 + 7x^3 + 24x^2 + 46x + 48
2x^2 + 7x + 14

Expand the squared binomial.
(x + 4)^2

x^2 -16
x^2 + 16
x^2 + 8x + 16
x^2 - 8x + 16

Use FOIL to multiply the two binomials.


Use FOIL to multiply the two binomials.
(b + 3)(b - 9)

b^2 - 27
b^2 + 12b - 27
b^2 + 6b - 27
b^2 - 6b - 27

Thanks in advance

Multiply and simplify: 10x(9x^2 + 6x + 7)
10x(9x^2 + 6x + 7)
=90x^3+60x^2+70x

The expression (2x+3)(3x+4) simplifies to which of the following?
(2x+3)(3x+4)
=6x^2+8x+9x+12
=6x^2+17x+12
=6x^2+8x+9x+12
=2x(3x+4)+3(3x+4) <------ This can actually be simplified further.
=(2x+3)(3x+4) <----------It is the original equation. This is because the original equation was already simplified.

Simplify:
(x2+5x+8)(x2+2x+6)
=x^4+2x^3+6x^2+5x^3+10x^2+30x+8x^2+16x+…
=x^4+7x^3+24x^2+46x+48

Expand the squared binomial
(x+4)^2
=(x+4)(x+4)
=x^2+4x+4x+16
=x^2+8x+16

Use FOIL to multiply the two binomials.
(b + 3)(b - 9)
=b^2-9b+3b-27
=b^2-6b-27

Hope this helps!

1. C (Multiply 10x by each number)
2. A (Foil-box)
3. A (Foil-box)
4. B (Foil-box)
5. d (foil :P)