4x - 5y = -12
-x + 5y = 18
-------------------add
3x = 6
x = 6/3
x = 2
4x - 5y = -12
4(2) - 5y = -12
8 - 5y = -12
-5y = -12 - 8
-5y = -20
y = -20/-5
y = 4
solution is (2,4) <==
Step-by-step explanation:
f(x)= Quotient × (x+2) + remainder
From this equation we obtain remainder by putting x=2 ( can you see why?)
Hence remainder is f(2)
Answer: 25x² - 64
<u>Step-by-step explanation:</u>
(5x + 8)(5x - 8)
= 5x(5x - 8) + 8(5x - 8)
= 25x² - 40x + 40x - 64
= 25x² + 0x - 64
=
NOTE: descending powers means the biggest exponent goes first, then the next biggest exponent, etc.
For example: x⁴ then x³ then x² then x then the number (which is actually x⁰)
6 percent of 7 is 86% so the percentage error is 24%