Answer:
~Subtract 12x-3x
(Combine like terms- subtract the coefficients which are 12 & 3 then copy the variable which is x)
*12x-3x = 9x
~Evaluate the expression (x+4) ÷ 2y when x=4 and y=2
Substitute the given value of variables then solve.
* (4+4) ÷ 2(2)
8÷4= 2
~Evaluate 15 ÷ x + 2y when x=3 and y=4
*15 ÷ 3 + 2(4) (remember the MDAS rule)
5+8 = 13
~Find the product of 3x(8x-5y)
(Use the distributive property, by multiplying 3x to 8x and -5y)
*(3x) × (8x) + (3x) × (-5y)
24x² - 15xy
~ Find the difference (5a + 4b) - (2a-3b)
First, find the opposite of 2a-3b by distributing or multiplying it from the negative sign.
Therefore, it will be 5a + 4b - 2a + 3b
*Combine like terms
*5a - 2a = 3a
*4b + 3b = 7b
Thus the answer is 3a+7b
