Question

Halle el valor de x si : 1 + 3 + 5 + 7 +...+ (2x – 7) = 144
A) 15
B) 20
C) 14
D) 24

Answer 1

Lets start with PEMDAS. For the numbers in the parentheses, we need to subtract 2x-7 to get -5. Now the equation is 1+3+5+-5x=144 since there are no exponents, multiplications, division, we need to add. 1+3=4. 4+5=5 and 5+-5x=0x. Now we have 0x=144. Then you need to divide