Question

Simplify 2x(x–5)+3 and find its values for (i) x= 1 (ii) x= –1

Answer 1

Answer:

2x²-10x+3

Step-by-step explanation:

2x(x-5)+3 = 2x²-10x+3

when x=1

2(1)-10(1)+3 = 2-10+3 = -5

when  x=-1

2(1)-10(-1)+3 = 2+10+3 = 15

Answer 2

Simplification of 2x(x–5)+3 is 2x² -10x + 3 and it value at x= 1 is -5 and value at  x = -1 is 15

Step 1:

Given expression is 2x(x–5)+3

Step 2:

Apply Distributive property a(b + c) = ab + ac

2x² - 10x + 3

Step 3:

Substitute x= 1 and find value at x = 1

2(1)² - 10(1) + 3

= 2 - 10 + 3

= -5

Step 4:

Substitute x= -1 and find value at x = -1

2(-1)² - 10(-1) + 3

= 2 + 10 + 3

= 15

Simplification of 2x(x–5)+3 is 2x² -10x + 3 and it value at x= 1 is -5 and value at  x = -1 is 15