Question

I have the answers jst need help working them out I will give a medal and fan whoever helps...

Answer 1

(-5x^2-2)+(3x^2+7)=-2x^2+5
(y^2+4-2y^3)-(3y^2-7y+4y^3)=-2y^2-6y^3+4+7y
(a+5)(a-3)=a^2+2a-15
(4p-3)^3=16p^2-24p+9
(7+x)(x^2+6x-8)=13x^2+34x-56+x^3

Answer 2

@TheSmartOne @campbell_st @sleepyjess @texaschic101 @amistre64

Answer 3

1st one is correct

2nd one has an error in y^3

Answer 4

the 2nd one also has an error in the sign of 7y

Answer 5

3rd one is correct

Answer 6

hint : when you have a + in the middle. you do not need parenthesis

-5x^2 - 2 + 3x^2 + 7 --- combine like terms
-5x^2 + 3x^2 = -2x^2
-2 + 7 = 5
now put them together..
-2x^2 + 5
===========
if there is a - in between, do this..
y^2 + 4 - 2y^3 - (3y^2 - 7y + 4y^3) --- distribute the - through the parenthesis
y^2 + 4 - 2y^3 - 3y^2 + 7y - 4y^3
now combine like terms
-2y^3 - 4y^3 = -6y^3
y^2 - 3y^2 = -2y^2
7y -- there are no like terms, but do not forget about it
4 -- no like terms
now put it all together..
-6y^3 - 2y^2 + 7y + 4
============
its that simple...just a matter of combining like terms

Answer 7

and the last 1 looks ok...

normally you should write then with the term having the highest power 1st... then in descending order of powers

Answer 8

(a + 5)(a - 3) --- solve using FOIL (first,outside,inside,last)

F -- multiply first terms in each set....a * a = a^2
O -- multiply outside terms in each set...a * -3 = -3a
I -- multiply inside terms on each set ... 5 * a = 5a
L -- multiply last terms in each set...5 * -3 = -15
now put it all together..
a^2 - 3a + 5a - 15 -- combine like terms
a^2 + 2a - 15

Answer 9

@texaschic101 great job but can u do the (7+x)(x62+6x-8)