Chapter ISG, Problem 1.2.6P

To determine

To calculate the given expression $x\left(z+5y\right)-2x^2$

Answer to Problem 1.2.6P

  $60$

Explanation of Solution

Given information:

  $x=2,y=7,z=-1$

  $x\left(z+5y\right)-2x^2$

Formula used:

Simplification of equation

Calculation:

To determine the equation

  $x\left(z+5y\right)-2x^2$

Firstly put the given value in the equation

  $2\left(-1+5\times 7\right)-2{\left(2\right)}^2$

To solve the power term

  $2\left(-1+5\times 7\right)-2\left(4\right)$

Multiply 5 to 7 and 2 to 4

  $2\left(-1+35\right)-8$

Adding the term in the bracket

  $2\left(34\right)-8$

Multiply 34 to 2

  $68-8$

Hence, on subtracting, the final answer is-

  $60$