Scholarship Exam Preparation App
Class 7 - (Math )
Algebra - Use of letters for numbers, factors of algebraic expressions. Value of the polynomial and operations on them
If x = -1, what is the value of 2x³ - 3x² + 4x - 5?
a :
-14
b :
-10
c :
4
d :
-12
Explanation :
2(-1)³ - 3(-1)² + 4(-1) - 5
= 2(-1) - 3(1) - 4 - 5 = -2 - 3 - 4 - 5 = -14
= 2(-1) - 3(1) - 4 - 5 = -2 - 3 - 4 - 5 = -14