Question 1- explain how sheldon immediately knew howard was incorrect?

question 2- identify where howard made a mistake in his work?

Part 1) In the procedure

Part 2) In the procedure

Step-by-step explanation:

Part 1) Observing the graph

The roots are x=-1/2 and x=4

Remember that, the roots are the x-values when the value of y is equal to zero (the x-intercepts)

That's why Sheldon immediately realizes Howard's solution is incorrect

Part 2) we have

The formula to solve a quadratic equation of the form is equal to

in this problem we have

equate the equation to zero

so

substitute

Howard's error is in this step, is wrong with the sign of the number 7, is positive instead of negative

d) 48

step-by-step explanation:

16,32,48,64,80,96,112,128,144,160,176,192,208,224,240,256,272,288,304,320,336