sabbathfamily sabbathfamily

14-11-2018
Mathematics

contestada

if (2x+a)(2x+b)=4x^2-4x+ab, then a+b = ?

A. -4
B. -2
C. -1
D. 2
E. 4

Respuesta :

choixongdong choixongdong

14-11-2018

Answer: a+b = -2

B. -2

Because if a = 1 and b = -3 then

(2x+a)(2x+b)=4x^2-4x+ab

Plug in a = 1 and b = -3 into (2x+a)(2x+b) then solve

(2x+a)(2x+b)

= (2x + 1)(2x - 3)

= 4x^2 + 2x - 6x - 3

= 4x^2 - 4x - 3 (so ab = - 3)

Answer Link

Otras preguntas

Arrange to following levels of classification in order from least specific to most specific. (Broadest Category) Family Domain Class Genus Order Kingdom Phylum

a researcher studying the effect of therapy on substance abuse had the experimental group undergo therapy with a general psychodynamic approach administered by

What could be the time of a place at 90-degree West longitude if the Greenwich Time is 12pm

Translate the following: "twice the sum of a number and 7 is negative fifteen"

Who was Gutenberg and what were his printing inventions? How did these creations affect religion?

A seed-bearing plant starts its growth from? A: An egg cell B: A Sperm Cell C: The Joining Of Egg And Sperm Cells

An in-line skater first accelerates from 0.0m/s to 5.0m/s in 4.5s, then continues at this constant speed for another 4.5 s. What is the total distance by the in

wo spools of equal mass, a and b, are pulled from rest up identical ramps by inextensible threads with the same tension. the thread is wrapped around spool a ma

a company has beginning inventory of 12 units at a cost of $28 each on february 1. on february 3, it purchases 38 units at $30 each. 17 units are sold on februa

Williamson, Inc., has a debt-equity ratio of 2.55. The company's weighted average cost of capital is 11 percent, and its pretax cost of debt is 5 percent. The c