Question

Find the product 3x² (2x - 5) and evaluate it for x = 1​

Answer 1

After solving the equation answer will be 6x3 -15x2
(6*1*1*1)-(15*1*1)
6-15
-9

Answer 2

To find : $3x^{2} ( 2x -5 )$

Given : $x = 1$

Solution :

• Product of $3x^{2} ( 2x -5 )$  $= 6x^{3} -15x^{2}$
• To find value of expression  $3x^{2} ( 2x -5 )$  we substitute the value of given of $x$ .  
• By performing simple subtraction and addition operations we get value .

• $3x^{2} ( 2x -5 )$  

       $= 3 (1)^{2} [2 (1 )-5 ] \\= 3 [2-5 ]\\=3(-3 ) \\=-9$  

Hence , product is $6x^{3}-15x^{2}$ and value of expression is $-9$ .