Simple questions with surds

1: --[reporting2] Doing 'do snippet' - should be imbed--

Simplify:
(2 - √3)(4 + √3)

2: --[reporting2] Doing 'do snippet' - should be imbed--

Simplify:
3√5 + √20

3: --[reporting2] Doing 'do snippet' - should be imbed--

Simplify:
√5√20

4: --[reporting2] Doing 'do snippet' - should be imbed--

Simplify:
(2 - √3)(2 + √2)

5: -mathformula not MarkupType-
Fatal error: Uncaught Error: Call to undefined method mathformula::makeTypeDef() in /var/www/vhosts/ent.storkey.uk/html/inc/reporting2.php:365 Stack trace: #0 /var/www/vhosts/ent.storkey.uk/html/inc/dynaPage.php(189): echo_value('surdexes1', 'content', Array) #1 /var/www/vhosts/ent.storkey.uk/html/inc/dynaPage.php(742): dynaPage->echo_value('content') #2 /var/www/vhosts/ent.storkey.uk/html/inc/dynaPage.php(179): mainPanel->write('main-panel') #3 /var/www/vhosts/ent.storkey.uk/html/index.php(21): dynaPage->write() #4 {main} thrown in /var/www/vhosts/ent.storkey.uk/html/inc/reporting2.php on line 365